Move socket API from experimental to dev channel and remove some dead code

chrome/test/data/extensions/api_test/socket/api/background.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // net/tools/testserver/testserver.py is picky about the format of what it
 // calls its "echo" messages. One might go so far as to mutter to oneself that
 // it isn't an echo server at all.
 //
 // The response is based on the request but obfuscated using a random key.
 const request = "0100000005320000005hello";
 var expectedResponsePattern = /0100000005320000005.{11}/;
 
-const socket = chrome.experimental.socket;
+const socket = chrome.socket;
 var address;
 var bytesWritten = 0;
 var dataAsString;
 var dataRead = [];
 var port = -1;
 var protocol = "none";
 var socketId = 0;
 var succeeded = false;
 var waitCount = 0;
 
@@ skipping 121 matching lines @@
   address = parts[1];
   port = parseInt(parts[2]);
   console.log("Running tests, protocol " + protocol + ", echo server " +
               address + ":" + port);
   chrome.test.runTests([ testSocketCreation, testSending ]);
 };
 
 // Find out which protocol we're supposed to test, and which echo server we
 // should be using, then kick off the tests.
 chrome.test.sendMessage("info_please", onMessageReply);